Exactly.Should I make a copy of the interface in the cardridge version or it immediately change ?If the second option, then what standard ?Standalone (directly to the edge connector), under the BUS board (original or new), or COMBO with the option of choosing which connector to assembly and connect to what ?

With the second 74ALS138 divide one 512K are for a 64K areas:/E0 and /E1: /Qx from first 74ALS138E2: +5VA0: A16A1: A17A2: A18

If using /Q0: 00H-1FH from first 138, then the outputs of the second:/Q0: 00H-03H/Q1: 04H-07H/Q2: 08H-0BH/Q3: 0CH-0FH/Q4: 10H-13H/Q5: 14H-17H/Q6: 18H-1BH/Q7: 1CH-1FH

The selected output will be the new /CART signal. Using Q0 from the first, and Q2 from the second, then the new external cartridge will be at 08H-0BH, next to the original.One gate from the 74LS32 make the /CART&RD signal.

Initial visualization.COMBO connector with the option of mounting elements for connection in a standard BusBridge or without it, or via BusExpander or FlexiBridge.Possibility to select a jumper of the standard cardridge segment (04-07) or the next (08-0B).It is possible to choose ROM 27128 or 27256.Jumper for connecting the IRQ signal from the ACIA to the INT input of the CPU.